Why would a shark not be a good index fossil?

The shark cannot be considered as a good indicator for fossil study. Because the species is known to have survived for a very long period of time. … And, therefore, do not corroborate to a specific period of time. Graptolites and Ammonites are considered as the best index fossils.

Why is a shark not a good index fossil?

A shark would not be a good index fossil because. A shark would not be a good index fossil because the species has survived for too long. A shark would not be a good index fossil because the species has survived for too long.

Are sharks good index fossils?

salt water would degrade the fossil over time. it doesn’t have structures that can be preserved in a fossil. …

What makes a bad index fossil?

Fossils that contain a lot of soft parts, single species that lived for long periods of time,were endemic to a specific region or are rare in the field today are criteria for being a poor index fossil that should not be used.

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What makes a species a good index fossils?

A useful index fossil must be distinctive or easily recognizable, abundant, and have a wide geographic distribution and a short range through time. Index fossils are the basis for defining boundaries in the geologic time scale and for the correlation of strata.

Why would a shark be a good index fossil?

The shark cannot be considered as a good indicator for fossil study. Because the species is known to have survived for a very long period of time. … And, therefore, do not corroborate to a specific period of time. Graptolites and Ammonites are considered as the best index fossils.

Which fossil species would make the best index fossil?

Trilobites serve as good index fossils, letting geologists date the age of the rocks that they are in.

How do you find a good index fossil?

To find the index fossil you must eliminate any fossils that don’t show up in each rock outcrop and those that show up in more than one layer per outcrop. We can eliminate “fossil 1” because it shows up in multiple layers in the same outcrop.

What are not good index fossils?

Birds, for example, would make bad index fossils, because although there are many species which have wide (indeed intercontinental) ranges, they fossilize very poorly: their skeletons come apart easily, and then their delicate honeycombed bones are highly susceptible to decay.

How index fossils determine the age of rocks?

To date rocks geologists first give a relative age to a layer of rock at one location. Then they can give the same age to matching layers of rock at other locations. Certain fossils, called index fossils, help geologists match rock to layers.

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Will humans be a good index fossil?

Some fossils are more useful than others in establishing the age of rocks. These are called index fossils. … It is possible that humans also will be good index fossils at some time in the distant future. Humans have distinct hard parts, and we often bury our dead.

What are the four conditions that must be met for a fossil to be an index fossil?

Characteristics of an Index Fossil

A good index fossil is one with four characteristics: it is distinctive, widespread, abundant, and limited in geologic time.

What do index fossil reveal about other material found with them?

Index fossils help scientists to find the relative age of a rock layer and match it up with other rock layers. Living fossils are organisms that haven’t changed much in millions of years and are still alive today.

Can the trilobite be considered an index fossil?

Because they evolved rapidly, and moulted like other arthropods, trilobites serve as excellent index fossils, enabling geologists to date the age of the rocks in which they are found.

What is the important use of index fossils?

Index fossils are used by both geologists and paleontologists to study the rocks and species of the past. They help to give a relative age for the rock layers and other fossils found in the same layer.

What is the oldest index fossil?

List of index fossils

Scientific Name Geological time interval Million Years Ago
Argopecten gibbus Quaternary 1.8 million years ago
Neptunea tabulata Quaternary 1.8 million years ago
Viviparus glacialis Tiglian (Early Pleistocene) 0.5 million years ago
Calyptraphorus velatus Tertiary
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Archeology with a shovel